This was used by the custom gas slider on the `send` screen, and it was used to modify the gas value before sending it out, breaking our new custom gas field logic.
Removed it and the logic that referred to this now-outdated parameter.
SubmitPassword was not creating a new id-management
This is because I broke up the old "createIdmgmt" method to not perform as much conditional logic.
Now the pieces are reusable and do what they should do.
Replace config-manager-singleton with one that is instantiated within the `background-controller`, and takes its persistence callbacks from its instantiated options.
Replaced class getters with more familiar get___() functions.
Signing now always takes a 64 digit hex string, and returns a message signature which appropriately pads r, s, and v with zeroes.
Need to verify with Denis that this is the behavior he requires.
